Everything nowadays is prone to hacking. Things as simple as drones to things as complicated as secured government servers. That shows that the terms “hack-proof” or “unhackable” are misnomers and an attempt at salesmanship.
There really is no perfect way to prevent hackers from getting into anything used with computers, like your Wi-Fi. From a digital perspective, your Wi-Fi is like your front door. Leaving it unprotected is a lot like leaving your door open. Thankfully, there are ways to safeguard it.